These are exciting times for 68k Amiga, so its a good time to re-join the community.

If your Amiga 500 is working properly you're in luck, but you will probably find a lot of the old disks are not working anymore.
You should know that there are stuff like GoTek drives that can easily replace the internal Floppy drive. Then you can load e.g. game images from a USB stick.
There are also some great expansions that make your trusty old A500 more useful.
For a more modest but great upgrade, take a look at ACA500+
For a more outrageous upgrade, google for Vampire 500 V2+
For adding internet access, there are projects like "Plipbox".